Heat-transmitting platen



Patented Nov. 4, 1930 UNITED series PATENT oFFIcE JOHN A. STEVENS, OFLOWELL, MASSACHUSETTS, ASSIGNOB TO THE UPSON COMPANY,

' OF LOCKIORT, YORK, A CORPORATION OE NEW YORK HEAT-T'RANSBEITTING-PLATEN Application filed May 10, 1928.

lvly present invention relates to heat transfer, and more particularlyto the construction of steam or other gas, air or liquid heated platens,and shaping elements useful, for instance, in the manufacture as acontinuous process of sheets and boards, or other forms of material,requiring heat treatment, such as, for example, composite board used asbuilding material and other services. The invention has for its objectto provide a simple, strong and reliable platen of this character, and amethod of producing the same, where-by, under the heat and pressure ofactual use, it will maintain its shape, and accurately heat and shapethe product upon which it acts.

To these and other ends the invention resides in certain improvementsand combinations of parts, all as will be hereinafter more fullydescribed, the novel features being pointed out in the claims at the endof the specification.

in the drawings:

F 1 is an end iew {according to the directions of travel of the materialacted upon) of a platen cons ructed in accordance with and illustratingone embodiment of, my invention, the same being shown broken away at thecenter;

F' 2 is a central horizontal sectional view taken substantially on theline 2-2 of Fig. 1;

S is an enlarged vertical sectional View taken substantially on the line3-3 of Figs. l and 2; I

Fig. 4: is an enlarged fragmentary sectional view corresponding to Fig.3, but showing a modified construction;

Fig. 5 is an enlarged fragmentary sectional view corresponding to Fig.3, showing an other modified construction, and

Fig. 6 is an enlarged fragmentary sectional view corresponding to Fig. 3showing still another modified construction.

Similar reference numerals throughout the several vie vs indicate thesame parts.

Although applicable in other instances, the present invention has beendesigned in the embodiment shown to facilitate the manufacture of aparticular type of board sheets or Serial No. 276,798.

tion, said board or other material embodying generally two facings orliners of paper enclosing an interior body of mineral or other material,the latter added for the purpose of strengthening and stifiemng theboard and also rendering it a water-resistlng, filG-IGSlSir' and soundand shock-proof agent. An c. ipie of such board 1s one 1n which amixtuie containing silicate of soda and dolomitic This invention has todo withthe construc tion of the platen units, per se and it hastherefore been deemed unnecessary to give a showing of a completemachine of this character, as long as the utility of the present invention can be explained in the foregoing general way.

Referring more particularly to the drawings, each platen unit, of whicha multiplicity are used in a complete machine, comprises a back plate 1,anda face plate 2, the latter being the exactly machined surface whichcontacts with the surface of the product which 1t confines, heats andshapes. Each plate, in the preferred form of Figs. 1, 2,

and 3, provided near its side margin with grooves or-channels 3 in whichfit the top and bottom edges of side plates 4. Each of the joints somade is autogenously welded from the exterior, weldings being indicatedat 5.

At suitable intervals throughout their ex pause as shown particularly inFig. 2, the plates are connected together by threaded or other formedstaybolts 6, the ends of which pass through counter-sinks 7 in therespective plates, and are riveted down into heads that fill the same,as indicated at 8. Live steam or heat is admitted through suitableconnections 9 in the side plates, and exhausted through similarconnections 10.

For the purpose of the particular applicalimestone or other material isintroduced be- 1 eat is applied and the ultimate thickness of tion ofthe invention hereinbefore outlined, the platens are designed for acorresponding temperature of 125 to 200 pounds steam pres sure or more,with an ultimate bursting res-- sure of not less than 5 times the woring riveted heads of the staybolts 6, and the face plate 2 is planed andsurfaced with the platen at its working temperature and pressure. Thus,there is no probability or possibility of the platen coming into use ina warped condition, which might otherwse occur, due to the varioustemperatures and tensions which it undergoes in the steps of theconstruction described.

In Fig. 4: I have shown a modified construction in the matter of theattachment of the side plates 1. In this instance the back and faceplates 1 and 2 are extended beyond the side plates a more considerabledistance, and instead of letting the side plates into grooves in theseadjacent plates, the extensions of the latter aforesaid are providedwith cleats 11 riveted at 12, and the autogenous welding is done betweenthese cleats and the side plates as indicated at 13 in said Fig. 4.

In Fig. 5 still another modification is shown in which the side plates 4are simply autogenously welded at 14 to the margins of the plates 1 and2.

In Fig. 6 the side plates 1 are shown flanged outwardly at 15, so thatthey have a channel like formation, and are riveted and caulked to theplates 1 and 2 at 16 with or without accompanying welding.

In all of these later mentioned constructions, the machining of the faceplate is accomplished under working pressure and correspondingtemperature as before.

I claim as my invention:

1. In a heat transmitting platen element, the combination with a faceplate and a back plate, both grooved at their edges, of side plates setinto the grooves of said plates at their opposite edges and welded tothe material thereof adjacent to said grooves, and a plurality ofthreaded connecting members each threaded into said face plate at oneend and threaded into said back plate at the other end, both ends ofasid threaded members being riveted to the respective plates.

2. In a heat transmitting platen element, the combination with a faceplate and a back plate both grooved at their edges, of side plates setinto the grooves of said plates at their opposite edges and welded tothe material thereof adjacent to said grooves, and

staybolt-s connecting the back plate and face independently of the sideplates, said staybolts being riveted into countersunk portions of saidplates.

3. In the manufacture of heat transmitting hollow platen elements, amethod embodying the construction of such an element with a face plate,a back plate and side plates and the subsequent machining of the faceplate While held at the temperature corresponding to the intendedworking heat or steam pressure of the platen.

4:. In a heat transmitting platen element, the combination with a faceplate and a back plate, of side plates interposed between said faceplate and said back plate, and a plurality of threaded connectingmembers each threaded into said face plate at one end and threaded intosaid back plate at the other end, one end of each of said connectingmembers being also riveted to said back plate and the opposite end beingriveted into a countersunk portion of said face plate.

JOHN A. STEVENS.

